The Department of Natural Sciences
Timothy J. Hoellein
Assistant Professor Biology and Environmental Science
Phone: office (646) 660-6247:
lab (646) 660-6245
Originally from western Pennsylvania, I graduated with a B.S. in biology, magna cum laude, from West Virginia Wesleyan College in May 2000, with a minor in chemistry and completion of the Honors Program. After graduation, I spent a couple of years employed in different biology fields. I worked with dolphins for 2 years with Dolphins Plus in Key Largo, Florida and British Virgin Islands. I spent a season working on a US Geological Survey research project on disease ecology of prairie dogs and black footed ferrets in central Montana.
Drawing upon my formative years spent in the Lake Erie and Pittsburgh regions of Pennsylvania, and through my job experience in the Florida Keys and Caribbean, I ultimately decided to pursue my Ph.D. in aquatic ecology at the University of Notre Dame. I felt this would be the best way to develop my interests and talents in advocacy for the understanding, education, and conservation of freshwater ecosystems.
My research has focused on the effects of 1) restoration strategies and 2) seasonal change on ecosystem processes in aquatic ecosystems. Both of these factors have the potential to alter rates of nutrient cycling, metabolism, microbial communities, organic matter dynamics, and fish communities via changes in light, leaf litter inputs, temperature, and stream substratum types. However, few studies have considered the interaction between seasonal dynamics and restoration projects in their evaluations.
General Biology 1003: Baruch College
Undergraduate Teaching Assistant: Principles of Biology, Diversity and Function, Experimental Biology
Graduate Teaching Assistant: Aquatic Ecology
Teaching Apprentice: General Ecology
Guest Lecturer: Aquatic Ecology, General Ecology, Human Impacts and the Environment, Stream Ecology, and Stream Ecology: Methods, Loyola University of Chicago and University of Notre Dame
Certification of Teaching Excellence in Biological Sciences. University of Notre Dame 10/15/06
- Hoellein, T.J., J.L. Tank, E.J. Rosi-Marshall, and S.A. Entrekin. In press. Temporal variation in substratum-specific rates of N uptake and metabolism and their relative contribution at the reach scale. Journal of the North American Benthological Society
- Kominoski, J.S., T.J. Hoellein, J.J. Kelly, and C. M. Pringle. In press. Does mixing litter of different qualities alter stream microbial diversity and functioning on individual litter species? Oikos.
- Entrekin, S.A., J.L. Tank, E.J. Rosi-Marshall, T.J. Hoellein, and G.A. Lamberti. 2008. Responses in organic matter accumulation and processing to an experimental wood addition in three headwater streams. Freshwater Biology 53:1642–1657.
- Hoellein, T.J., J.L. Tank, E.J. Rosi-Marshall, S.A. Entrekin, and G.A. Lamberti. 2007. Controls on spatial and temporal variation of nutrient uptake in three Michigan headwater streams. Limnology and Oceanography 52 (5) 1964-1977. Hoellein et al. 2007.pdf
- Entrekin, S.A., E.J. Rosi-Marshall, J.L. Tank, T.J. Hoellein, and G.A. Lamberti. 2007. Macroinvertebrate secondary production in forested sand-bottom streams of the Upper Midwest. Journal of the North American Benthological Society. 26 (3): 472-490. Entrekin et al. 2007.pdf
As a new professor at Baruch College, my career vision is to combine environmental research with teaching and public service. My overarching goal is to influence public awareness and restoration of local freshwater ecosystems through research, education, and outreach. I am also keenly interested in collaborating with other instructors, researchers, and generally interested citizens to include ecological perspectives in subjects such as ethics, law, economics, and social justice.